Wi-Fi module introduction--TYJW2.1

Last Updated on : 2021-04-22 10:20:56download

Product Overview

​ TYJW2.1 is a Wi-Fi module, developed by Hangzhou Tuya Information Technology Co., Ltd., for serial port communication at the level of 5V TTL. It mainly consists of a highly integrated wireless RF chip ESP8266EX and external flash chip, with the built-in Wi-Fi network protocol stack and rich library functions. TYJW2.1 also contains a 32-bit CPU of low power consumption, 1Mbyte flash and 36K SRAM.

​ TYJW2.1 is also an RTOS platform integrating all Wi-Fi MACs and TCP/IP protocol libraries. The user can develop embedded Wi-Fi products that meet their needs, based on serial communication.

​ The structure of TYJW2.1 is shown in Figure 1:

Wi-Fi module introduction--TYJW2.1

1.1 Features

  • Built-in 32-bit CPU of low power consumption, also used as an application processor.

​ Main frequency: 80MHz and 160MHz

  • Operating voltage: 4.5V-5.5V
  • Peripheral: 1×UART (level: 5V TTL)
  • Wi-Fi connectivity

​ 802.11 b/g/n

​ Channel 1-14@2.4GHz

​ Support the WPA/WPA2 security mode.

​ Output power: maximum +20dBm in the 802.11b mode.

​ Support the STA/AP/STA+AP mode.

​ Support the SmartConfig function (including Android and IOS devices).

​ IPEX connector between the onboard PCB antenna and external antenna.

​ Operating temperature: -20℃ to 85℃

1.2 Main Applications

  • Smart buildings
  • Smart home/household appliances
  • Healthcare
  • Industrial wireless control
  • Handheld devices

Module Interface

Size and Package

Electrical interface of TYJW2.1: PH-4AW connector, with the pin spacing of 2.0mm.

Size of TYJW2.1: 49.6 mm (W)×31 mm (L) ×9.1 mm (H). Refer to Figure 2 for its package.

Wi-Fi module introduction--TYJW2.1

Pin Definitions

The interface pins are defined in Table 1.

​ Table 1: Layout of TYJW2.1 Interface Pins

PinSymbolIO TypeFunction
1RXI/ORX communication port of the module, with the input level of 5V TTL
2TXI/OTX communication port of the module, with the input level of 5V TTL
3GNDPReference ground pin of the power supply of module
4VCCPInput pin of the 5V power supply of module

Note: P is the power pin, and I/O is the input/output pin.

Test Pin Definitions

Test pins are defined in Table 2.

​ Table 2: Layout of TYJW2.1 Test Pins

PinSymbolIO TypeFunction
53.3VPPin of the internal 3.3V power supply of module
6GNDPReferent ground pin of the power supply of module
7BOOTI/OIO0 pin, for module firmware programming
8TXD1I/OModule information printing port
9RXD0I/OModule firmware programming port
10TXD0I/OModule firmware programming port
11RSTI/OModule hardware resetting pin

Notes: P is the power pin, and I/O is the input/output pin.

When the IO0 is null, the module runs normally; and when IO0 is at the low level, the module is in the status of firmware programming.

RST is used for module hardware resetting only, but not for clearing Wi-Fi network information.

Test pins are not recommended.

Electrical Parameters

Absolute Electrical Parameters

​ Table 3: Absolute Parameters

TsStorage temperature-2085
VCCPower supply voltage-0.35.5V
Electrostatic discharge voltage (human body model)TAMB-25℃-2KV
Electrostatic discharge voltage (machine model)TAMB-25℃-0.5KV

Operating Conditions

​ Table 4: Normal Operating Conditions

TaAmbient temperature-20-85
VCCOperating voltage4.555.5V
VILIO low-level input-0.3-VCC*0.25V
VIHIO high-level inputVCC*0.75-VCCV
VOLIO low-level output--VCC*0.1V
VoHIO high-level outputVCC*0.8-VCCV
ImaxIO drive current--5mA

Power Consumption for Wi-Fi Transmission

​ Table 5: Power Consumption of Continuous TX Transmission


Power Consumption for Wi-Fi Reception

​ Table 6: Power Consumption of Continuous RX Reception


Power Consumption in Operating Mode

​ Table 7: Operating Current of TYJW2.1

Operating Mode**Operating Status (**Ta=25℃)AverageMaximumUnit
Fast connection networking statusThe module is in the status of fast connection networking, with the Wi-Fi indicator flickering fast.90151mA
Hotspot networking statusThe module is in the status of hotspot networking, with the Wi-Fi indicator flickering slowly.101451mA
Network connection statusThe module is connected with the Internet, with the Wi-Fi indicator normally ON.58.5411mA
Network disconnection statusThe module is disconnected from the Internet, with the Wi-Fi indicator normally OFF.156430mA

RF Characteristics

Basic RF Characteristics

​ Table 8: Basic RF Characteristics

ParameterDetailed Description
Operating frequency2.400-2.500GHz
Wi-Fi standardIEEE 802.11b/g/n (Channel 1-14)
Data transmission rate11b:1,2,5.5, 11 (Mbps)11g:6,9,12,18,24,36,48,54(Mbps)11n:HT20 MCS0~7
Antenna typePCB antenna (default)U.FL RF connector: external antenna (optional)

Wi-Fi Output Power

​ Table 9: Continuous Transmitting Power of TX

Parameters Min.TypicalMax.Unit
RF average output power, 802.11b CCK Mode1M-20-dBm
RF average output power, 802.11g OFDM Mode54M-17-dBm
RF average output power, 802.11n OFDM ModeMCS7-14-dBm
Frequency error -10-10ppm

Wi-Fi Receiving Sensitivity

​ Table 10: RX Sensitivity

Parameter Min.TypicalMax.Unit
RX sensitivity at PER<8%, 802.11b CCK Mode1M--91-dBm
RX sensitivity at PER<10%, 802.11g OFDM Mode54M--75-dBm
RX sensitivity at PER<10%, 802.11n OFDM ModeMCS7--72-dBm

Antenna Information

Antenna Type

Two kinds of antenna are applicable: PCB board antenna and external antenna, the former of which is applied in the default mode. For the use of the external antenna, contact our sales staff.

Reduction of Antenna Interference

When the PCB board antenna is used in the Wi-Fi module, it is recommended to keep the module antenna at least 15mm away from other metal parts, in order to optimize the Wi-Fi performance.

U.FL RF Connector

​ The parameters of the U.FL RF connector are shown below.

Wi-Fi module introduction--TYJW2.1

Packaging Information and Production Guide

Mechanical Dimensions

Wi-Fi module introduction--TYJW2.1

Production Guide

Module storage conditions:

  1. The moisture-proof bag must be stored in the environment with the temperature below 30℃ and the relative humidity less than 85%.
  2. The warranty period of the product in the dry package should be six months from the date of packaging.


  1. All operators must wear the electrostatic ring during production.
  2. The module must be prevented from water or dirt during operation.